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.....................................................................................................................................--- !ruby/object:RI::MethodDescription 
aliases: []

block_params: 
comment: 
- !ruby/struct:SM::Flow::P 
  body: Equivalent to <tt>String#swapcase</tt>, but modifies the receiver in place, returning <em>str</em>, or <tt>nil</tt> if no changes were made.
full_name: String#swapcase!
is_singleton: false
name: swapcase!
params: |
  str.swapcase!   => str or nil

visibility: public